{
  "pce": [
    { "id": "ma", "grp": "pce", "class": 2, "rating": "E", "cost": -1, "mass": 2.5, "passengers": 2 },
    { "id": "mb", "grp": "pce", "class": 3, "rating": "E", "cost": -1, "mass": 5, "passengers": 4 },
    { "id": "mc", "grp": "pce", "class": 4, "rating": "E", "cost": -1, "mass": 10, "passengers": 8 },
    { "id": "md", "grp": "pce", "class": 5, "rating": "E", "cost": -1, "mass": 20, "passengers": 16 },
    { "id": "me", "grp": "pce", "class": 6, "rating": "E", "cost": -1, "mass": 40, "passengers": 32 }
  ]
}